Days Sales Outstanding, Days Payable Outstanding, and Days Sales Inventory

Days Sales Outstanding (DSO), Days Payable Outstanding (DPO), and Inventory Turns are some key metrics for company analysis. While they are just some simple calculations, they tell are story about how a company is doing.

In the balance sheet assumptions section of the model, see below, we calculate each metric and then make assumptions about the forecast values.

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Circular References in Financial Models

What is a circular reference?

A circular reference is when a cell refers to itself directly or indirectly.

Are circular references bad?

In most cases, a circular reference should and can be avoided with some planning. However, in a complex financial, I found it easier to just use circular references in certain areas.

Circular References in Financial Models

Circular references are used to help calculate cash balances. Let’s walk through two typical cases.


The cash sitting in the bank generates interest. The interest income is taxed and lowers the net income. More cash -> more interest -> more tax -> lowers net income -> effects cash.

See the example below. To determine the amount of interst, we use an average of the forecasted beginning and ending cash balances. It’s not fair to use just the beginning or the ending cash balances to calculate interest because over the time period that balance will change. Continue reading “Circular References in Financial Models”